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London mayor Boris Johnson has promised "a Paralympics that will dazzle the world" as organisers confirmed the event was on course to sell out and the symbol of the Games was raised at central London landmarks.

So there we have it. The Olympics are all done, and what a resounding success they've been. The main stadium didn't fall to bits, the flame didn't go out, the plug to the TV camera didn't fuse during the 100m, nobody kidnapped the Queen, and what's more the British team won 29 gold medals. Well done, us! What a glorious nation! Twenty nine gold medals, though!

Mo Farah’s coach, Alberto Salazar, has told the Guardian he is increasingly confident the United States Anti-Doping Agency’s investigation into him will find no evidence of any wrongdoing and insisted the two-time Olympic champion would be staying with his Nike Oregon Project training group despite recent rumours to the contrary.

In the shadow of the Bird’s Nest stadium, about to be pressed back into one of its rare bursts of meaningful sporting action in the seven years since the 2008 Olympics, a slow burning battle that could decide the future of athletics is about to explode.

Athletics is facing another doping crisis after what is claimed to be the biggest ever leak of blood-test data revealed a third of medals, including 55 golds, in endurance events at Olympics and world championships between 2001 and 2012 were won by athletes who recorded suspicious tests.